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The OTELO survey. Faint end of the luminosity function of [O II]3727 emitters at ⟨z⟩ = 1.43
Cepa, J.; Pérez García, A. M.; Alfaro, E. J. +15 more
Aims: In this paper, we aim to study the main properties and luminosity function (LF) of the [O II]3727 emitters detected in the OTELO survey in order to characterise the star formation processes in low-mass galaxies at z ∼ 1.43 and to constrain the faint-end of the LF.
Methods: Here, we describe the selection method and analysis of the …
Clustering of low-mass stars around Herbig Be star IL Cep - evidence of 'Rocket Effect' using Gaia EDR3 ?
Arun, R.; Mathew, Blesson; Manoj, P. +7 more
We study the formation and the kinematic evolution of the early-type Herbig Be star IL Cep and its environment. The young star is a member of the Cep OB3 association, at a distance of 798 ± 9 pc, and has a 'cavity' associated with it. We found that the B0V star HD 216658, which is astrometrically associated with IL Cep, is at the centre of the cav…
A Multiwavelength Study of the Formation of the AFGL 333-Ridge
Wang, Jun-Jie; Xu, Jin-Long; Xu, Ye +1 more
We presented a multiwavelength study of the AFGL 333-Ridge. The molecular line data reveals that the AFGL 333-Ridge has two independent velocity components at -50.5 and -48.0 km s-1. In the position-velocity diagram, the bridge feature connects with two parts that are spatially correlated but separated in velocity. This observational ev…
Optical detection of the rapidly spinning white dwarf in V1460 Her
Dhillon, V. S.; Pelisoli, Ingrid; Breedt, E. +15 more
Accreting magnetic white dwarfs offer an opportunity to understand the interplay between spin-up and spin-down torques in binary systems. Monitoring of the white dwarf spin may reveal whether the white dwarf spin is currently in a state of near-equilibrium, or of unidirectional evolution towards longer or shorter periods, reflecting the recent his…
The Solar-cycle Variations of the Anisotropy of Taylor Scale and Correlation Scale in the Solar Wind Turbulence
Zhou, G.; He, H. -Q.
The field-aligned anisotropy of the solar wind turbulence, which is quantified by the ratio of the parallel to the perpendicular correlation (and Taylor) length scales, is determined by simultaneous two-point correlation measurements during the time period 2001-2017. Our results show that the correlation scale along the magnetic field is the large…
Gaia EDR3 parallaxes of type I X-ray bursters and their implications on the models of type I X-ray bursts: A generic approach to the Gaia parallax zero point and its uncertainty
Deller, Adam T.; Miller-Jones, James C. A.; Ding, Hao
Light curves of photospheric radius expansion (PRE) bursts, a subset of type I X-ray bursts, have been used as standard candles to estimate the `nominal PRE distances' for 63% of PRE bursters (bursters), assuming PRE burst emission is spherically symmetric. Model-independent geometric parallaxes of bursters provide a valuable chance to test models…
Radial Velocity Monitoring of the Young Star Hubble 4: Disentangling Star-spot Lifetimes from Orbital Motion
Anderson, Jay; Johns-Krull, Christopher M.; Prato, L. +1 more
We studied the weak-lined T Tauri star Hubble 4, a known long-period binary, and its star-spot phenomena. We used optical radial velocity (RV) data taken over a span of 14 yr (2004-2010, 2017-2019) at the McDonald Observatory 2.7 m Harlan J. Smith Telescope and single epoch imaging from the Hubble Space Telescope (HST)/Wide Field Camera 3 instrume…
Understanding the Angular Momentum Evolution of T Tauri and Herbig Ae/Be Stars
Osorio, Yeisson; Hernández, Jesús; Roman-Lopes, Alexandre +8 more
We investigate a sample of six Herbig Ae/Be stars belonging to the Orion OB1 association, as well as 73 low-mass objects, members of the σ Orionis cluster, in order to explore the angular momentum evolution at early stages of evolution, and its possible connection with main-sequence Ap/Bp magnetic stars. Using FIES and HECTOCHELLE spectra, we obta…
Imaging from STIX visibility amplitudes
Massa, Paolo; Krucker, Säm; Piana, Michele +5 more
Aims: This study is aimed at providing the first demonstration of STIX Fourier-transform X-ray imaging using semi-calibrated (amplitude-only) visibility data acquired during Solar Orbiter's cruise phase.
Methods: We used a parametric imaging approach whereby STIX visibility amplitudes are fitted by means of two non-linear optimization me…
A lighter core for Phobos?
Li, Fei; Pätzold, Martin; Yan, Jianguo +7 more
Context. The origin of the Martian moons Phobos and Deimos is still poorly understood, and is the focus of intense debate.
Aims: We demonstrate that a stratified internal structure of Phobos is compatible with the observed gravity coefficients.
Methods: We fit previously derived C20 and C22 Phobos gravity coefficien…